Promiscuous marsupials in Australia are having so much sex they’re dying off at alarming rates just days after copulation.

The black-tailed dusky and silver-headed antechinus were moved to the endangered species list after researchers discovered the sex-mad, mice-like creatures partake in frantic 14-hour mating sessions that leave males exhausted.

Lead researcher Andrew Baker explained to CNN how constant high testosterone levels in the male antechinus produces high levels of cortisol, a stress hormone, causing its immune system to go haywire.

The antechinus then suffers fatal internal bleeding, according to the report.

Their populations currently number in the hundreds, according to experts, leaving various antechinus species vulnerable to extinction if post-sex male die-off rates continue to outpace reproduction.

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